Cellular Dynamics of the Outer Layers of the llair Follicle of Fine-Jilool Sheep During the Phase of Stable Hair Growth

Abstract

The structure, origin, and migration of outer sheath cells of the hair follicles of domestic sheep were studied by electron microscopic, autoradiographic, and histochemical (glycogen) in order to understand 111. t?t: of this layer i1 hlir norphog.nesis. WJ demonstrated that the c.ls or tfe outer layers of the ourer sheath interpose into the i-4ner "companion" Iayer of the or.rter sheath, Although this processiakes place all alorig-th9 hair foliiclg rroni {9 iower'bulb up to the sebaceous glanir oiin."r, It rnul"iy tut". pL." over the putu' Itabelg{ cellgirilglposed into the companion layer move tJwards sebaceous gJandsbrifices m ore than24 hours fas1e1 fhan labgled cells ofthe inner sheath and hair, because these cells iicluded the label not in the bulb cambium (as hair and inner.sheath) btrt over the bulb, and from this point they start movement. Inter- position of qplls,illoJ[e cbmpanion layer must calrse increase of its volume and additional volume supposed to b: leq away into tfre pif41 cana-l around the hair near the sebaceous glands orifices. This can provide the mechanism for the prolagation of the hair and inner sheath promotion io sebaceous gland orifices.